Mining-machine.



D, TIIISIII-:IL

MINING`IIIACHINE.

APPLICATION FILED 00T. II, I9I3.

fl SHEETS-SHEET I.

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IIIIH ER@ mm n. I. FISHER.

MINING MACHINE.

p 2J? y? APPLICATIONIILED 00118, 1913. y 9 Il M L9 5, im ..,atex1tcII0vm0,I9IZ.

4 SHEETS-SHEET 2.

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Y Y d. IIIHIIIII IIIIIIII KC Iii IIIIIIIIIIIH ,med Nm 2U, IBI? 4 SHEETS-SHEET 5 o@ I d f@ D. T, HSHEHY.

MINING MACHINE,

APPLICATION FILED OCT- 8| I9I3I COMPNY, 0F COLUMBUS, HIO, ACORPRATN 0E' EH.

MINING-MAGHNE.

The inventionrelates to side cutting machines and especially to machines of this class which are adapted for usein room and pillar mining.

The object of the invention is the provision of improved means for guiding the mav chine and holding it up to the work as it is fed along the face of the coal. Machines of thecharacter in question, such as are now in common use, comprise a bed frame designed to rest upon and -move freely over the floor of the mine and an endless chain' cutting apparatus inner end ofthe bed frame and is, as an4 which projects from the entirety, fixed in relation to said frame. The bar which supports and guides the cutterchain must be relatively narrowto per- `mit the machineto be directed upward or i downward as the side cutting proceeds, and, ginasmueh as it 'is necessary to work close to ithe ribs or-side Walls'of the room, it is also {necessary that the bed frame be relatively narrow. Up to the time of my invention, these machines have been propelled or fed along the face of the coal by a flexible draft dev1ce c able, chain or the like-arranged to exert a forward draft ori/the inner part vof the bed frame, and a. section of cable or chairfhas been arranged to exert a retarding draft on the outer part of the machine to counteract the reaction of the coal against the cutters and prevent the outer end `oi" the any.

7 be prevented f machlne from swinging forward too rap- My invention contemplates the use ofa cable or the-like for propelling the machine the face of the coal, but I effect the alon guidnce lof themachine and hold it in proper relationto the face of the coal in a manner' and by means differing from vthose heretofore'employed. It has'heen discovered that an endlesschain cutting apparatus can the coalqif it is inclinedforward so that its inner end leadsthe .outer end sufficiently. l l

take advantage Ofthis characteristic of ,the

Specication of Letters Patent.

'the line 4--4 of Fig. l;

Iom workingout from under- Patented New. 25d, tutti?.

Application led October 8, 1913. Serial No. 794,122.

endless chain cutting apparatus and provide the machine with a guide bar secured to the inner' end of the bed frame` and projectingforward therefrom along the face of the coal so as to give the machine, in effect, a bear ing point against the coal face considerably in advance of the machine proper. ln this way the tendency of the outer end of the machine tc swing forward, due to the reaction of the coal on the cutters, is resisted. and this resistance to the swinging of the machine taken in connection with the tendency of the cutters to hold the machine up to the face by reason of the inclination oi the cutting apparatus, results in'the maine tenance of the machine relation to the coal face as the under-cutting. proceeds. Furthermore, l provide a connection between the guide bar and the bed frame adapted to readily permit movement of the bar relative to the frame and even the. entire removal of the bar from the frame, if that he desired; and hence it is possible to work with my machine close to the ribs or side Walls of the room.

lVithout limitation of my invention to any specic construction7 I show in the accompanying drawings, as 'an illustrative embodiment of the invention,.the construction which I at present deem preferable.

In the drawings, i

Figure l -is a plan View ofthe machine with the guide bar removed, upper parts being removed or broken away to illustrate the gearing in the lowermost parts of the machine;

Fig. 2 is a left side elevation of the .ma chine as shown .in Fig. 1; i

Fig. 3 is a fragmentary View showing iu rear elevation a detail ci the construction at the outer rear corner of the hed frame;

Fig. 4 is an enlarged vertical section on 5 is a detail vertical sectional view of the clutch which connects the driving gearing to the rear sprocket wheel of the cutter chain, and of the devices for actuating said clutch;

Fig. 6 is an enlarged vertical longitudinal section on the line 6**5 of Figui;

Fig. 7 is an enlarged vertical longitudinal section .on the line -7 of nig. l;

Fig. 8 is a diagrammatic view showing the 'machine at the beginning of the sumping or. entering: cut;

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Fig. 9 is a diagrammatic view showing the machine when the sumping` cut has been completed and the side cut is about to be started;

Fig. 10 is a diagrammatic view showing the machine at the end of the swinging movementwhich it is given at the beginning of the side cut, and prior to the4 attachment of the guide devices o' Fig. 11 is a dia rammatic view showing the machine with t e guide devices attached preparatory to a continuation of the side cutting along the face;

Fig. 12 is a diagrammatic view showing the machine at the point at which the guide barencounters the left rib;

, Fig. 13 is a diagrammatic view showing the position taken by the machine as it advances from the position shown in Fig. 12 along thev guide bar;

Fig. 14 shows the machine with the guide bar removed and the side cut completed;

Figs. 15, 16 and 17 are detail views of parts of the guiding apparatus detached.

Referring in detail to the construction shown, the bed frame is composed of a bottom plate 1, flanged side plates 2, 2 and a top plate 3 which is preferably in the form of a casting, allof which are connected to form a rigid box-like structure open at its inner and outer ends. 4 is a cutter bar or arm'which projects from the inner end of the bed frame and extends outward between.

the top and bottom plates thereof, being rigidly secured to the said frame. This cutter bar, which as to details may be constructed in any preferred manner, is formed with a longitudinal slot or opening 5, and has in its outer periphery a guide orl way for an endless cutter chain 6. Adjacent the outer end of the cutter bar is a sprocket wheel 7 over which -the cutter chain passes and by which it is driven. The sprocket wheel 7 is loosely mounted on an upright shaft 8 lwhich has its lower end mounted on the `bottom plate 1 of the bed frame and is preferably secured to the bottom plate by means of a base casting 9 riveted to said plate, the casting having an aperture in which the shaft is tightly fitted, and further secured by a key 10. The shaft 8 can be given further support in the manner indicated in 5 which shows the motorpresently to e described-having its frame metal formed with a socket to receive the upper endof the shaft.

The machine is designed to be propelled along the face of the coal during the cutting operation by a cable or rope, and upon the inner end of 'the bed frame is mounted a Winding drumill. A suitable draft cable 12 has one end secured to the winding drum so that it can be wound upon the drum when the latter is turned. The cable 12 passes downward from the drum and under a guide sheave or pulley 13 which is mounted in a block 14. This pulley block is in the natureI of a caster frame having a hollow or cylindrical stem or spindle mounted in the top plate of the .bed frame. The arrangement is such that the cable 12 passes downward through said hollow spindle and thence under the pulley. With the pulley mounted in this manner-,it will be seen that the cable 12 can be led off in any desired direction within a range of about 180; The drum 11 is mounted upon a longitudinally arranged shaft 15 carried in bearings-16 and 14 on the top plate of the bed frame.

18 is an electric motor which, as to details of construction, may be of any preferred form, and which is mounted upon the outer i end of the bed frame with its armature shaft arranged longitudinally of the machine.`

This motor is designed to drive the wind ing drum 11 and the cutter chain 6, and to this end the following'gearing is provided. The armature shaft 19 of the motor carries at its inner end a bevel pinion 20 which meshes withv abeve gear 21 on the vertical shaft 22. The lower end of this shaft is mounted in a bearing 23 formed in a depending bracket on the bed frame (see Fig. 4). The upper end of thevshaft turns in a bearing 24 carried by an upstanding frame or yoke 25 mounted on the bed frame'. 26 is a worm loosely mounted on the shaft 22 and operatively connected with -thebevel j gear 21 by means of an improvedvfriction I.

clutch mechanism which entirety by 27. v

The clutch mechanism 27 comprises the is designated as an following parts. 26a is an upward extension carried by the worm 26 and forming' the driven element of the clutch. The depend-y ing hub 21*x ofthe gear 21 constitutes the that of the well known VVe'ston clutch. 29l-s a follower plate or ring by which the friction disks 28 can be pressed together 'and against the driven element 26a. The bevel gear 21 is formed with a series of apertures 21b to receive a corresponding series of c0mpression springs 30 which have their. lower ends resting upon the follower plate 29 and their-.upper ends engaging adjustable threaded cups 31 by which' the tension of the springs can be adjusted. The follower plate 29 has a depending flange 29n formed with a groove to receive pivoted slideblocks 32 mounted in the ends of a forked lever 33, this lever being pivoted at 34 on a part of the frame structure. The oppositer end'of the lever 33 is'v apertured to receive an upegeiiist l ive-eme@ right rod which ceri-ies abutment mits 36 'to engage `the upper side of the lei/jor 38 and o spi-ing 8'? W ich is iiiterpoeed between the iower' side of the ievei.' and Weshei 38 Whieh rests upon a, mit 39 on the lower end of the Tod 35.' The opper ered of the rod 35 :is pivoted to en erm 40 on, e, .i'ookei Sheitil mounted iii yoiie '45:2 ie e hond lever seemed to the outer lend of the rooke' shaft 4i. Ly pressing down oo the heed iev-ei' 42 the foiowei' plete 2t* com he iifted iii opp@ eitioo to the springs 30 to ieiieve the iiotion disks of piessuie, ond hy lifting the hond lever 2, the spiing 3'? een he drawn upweed the lever 33 to increase the pres-sure on the oiiowei plete 29 to any desired extent.

hell hearing 43 is interposed between `the geef 21 and the :ti-ome yoke 25, and a Simile? heating fifi ie interposed between the 26 vand the geur Thfough these .heeiing's the thrust oit' the worm and the ice- :iotioii of the dutch spiiiigs ae transmitted 'tothe frame yoke.

` end.

@he worm 25 meshes with a. worm 'Wheel 45, wiiioh is mounted upon. e. longitudinally .disposed Shaft fio. "ihie shaft is mounted in bearings 47, 128, oei'iied hy the top plete.

of the hed eme. ./ipiiiioii 4:9 is mounted to .time iooseiy on shaft :i6 :idjeeent the beering 48, and upon the front eed of the shaft do is iiiouizted e spin' pinion 50. The latter pinion has e siee've-iike hub extension 50-FL Which extends through the hase elge spur gear 5]. keyed 'to its outer The outer end of 'the heb oi" 5l is 'fofmed with i toothed @hitch extension andthe pinion elsoooiiies on its ione-t end e toothed clutch element A, grooved cllitoh colier 5d is siidably keyed iipoo sho-ft 16, and by menne of it either the pinion 49 or the geeii and pinion 50 con, et ivilL he .clutched to the Shettfi-G. The clutch eoihir 5e ie shit-ted hy ineens of a level firm Whioh is secuied to the iowei' end of e ver 'tical shaft 56, seid shaft carrying its eppoi* end a transversely disposed hand lever or bei 57. The ieveif o? piei'erehiy extends to both sides 'of the machine so that it een iezidiiy he grasped by the operator when. standing' at eitheij side f the iiiechine.

The pinion 9 meshe with o, gem Wheei' which is mounted upon the outer end of o hoit shaft 59, ti e shaft heilig oel'ed ioy a bearing; di) on the bed frame. hl is e pinion hearing li7 and 5 'eeoiired the inner end oi' the "shaft 59 and meshing; with the gem' wheel 5i. The pinion 50 meshes Withi'o large gear G2 'which is A,.ifejye'd to the shaft l5 upon which the winding drum l1 is, mounted. `63 is e bail thrust hearing which is inteiposed betiieen the pini'o'ii 49 'end the hearing L1-8 `to take my axial thrust that may resuit fiom the tation of .the .Woiimeod Worin Wheei. n;

" iitfvvi, he seen thot by means of the gear 'semi-ojdindiieei boe-eee im, there heiiif" 'at its lower end to the lever .convenientiy ing described, the winding drum li. can he driven at eitheil one of two speeds from the shaft 22, which itself is diectiy di'iveii by the motor. Thus) if 'che chitch 5112 is thrown so iis to make the pioioii ii) fest on the shaft the rotationt ot' seid shaft wiii be t mit-ted thiough the pinion it* und gear to the Shaft 59, thence through pinion 6l, 5i, pinion 50 and goei' G2 to the Winding drum ll. `@o the other houd, if clutch is thrown so es to conileot gooi' 5l mid with it pinion 50 to the shaft fi-G, the z oto'tion of Seidl shaft is then t'mnsii'iitted directly thiough the pinion 50 sind gear G2 to the Winding di'uiii il, thus rotating 'the lette? at. considerably higi'ier Seeed than before. 1y(5i/Vith the dutch thioii'n es hiet describede it Wiil he noted that pinion Si., geni and pinion i9 turn idly.

The foiiowinp; devices ere provided for 'driving the cutter ehaiii. @n the vertice?. shaft 22, and meer its lower end is mounted o, Spui' pinion. iii which meshes; 'with ien' epm' geer- 65 which is mounted to tum -'i'eoy upon the upright shaft i3, said gear heilig disposed directly above the cottoi' cheiii spi'ocket Wheel 'i'. Un the upward extending hub oiZ the gooi is Siidebiy mounted eooiiei' @o mich carries e plureiity of depending' clutch pine if?" which extend 'through apertures in the web of the Spui' wheel 65. The Lippe? fe'ceoi" the Sprocket Wheei iis piovided with it oi hoiiow one to correspond "with eef/h o the ci h eine o7", and when the ooiieir tio ood @oid pine aie in 'their ioweivmost iioeeiitiojiij the i so that iototion oit' geo/i wheel is transmitted Ato Sprocket Wheei 'il The Coor 56 ,is grooied to receive :i hand 68 to which is Connected :L ieafcif eroi '39 having its oifwti'd end pivotoiiy ooo .nected et 70 to 'the rigid "pmt of the hed freine structure. A hok ie eoiioieoted 59? and et its eppoi' end islcoiiiected to :in eccentric houd 72 which [ite iipo en ecceo Said eoceiitiio is mounted upon o Soren' sind 74 `which projects 'tom the trout iiice oi.Z the 'Ei-eme of motor i8, und the eccentric is provided with a pivoted hoodie 75 by momie oi? which' it een oe turned to .fictuete the .iiiii 7l and mise and lower the clutch coiiai- GG.

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.it will be noted that the oodle To i'e'iy ioczited to he grasped by t operator when he desires to throw the chain into or out of opei'otion.

I prefer to inoioee the inner trein of goei'- ing by e casing 76 for obvious reasons. U11 one side ofthis casing, the top port of which is broken away in Fig. l to disclose the ejem l ing, mount e rheostet 'i7 foithe iiiotoi and :in operating shaft 78 extends from i'heoetat to the outer end of the hed ifi-ame .Whei'e it is ',-i'i'ovided with hood wheei -7 me cutter which can be conveniently grasped by the operator when at the outer end of the machine.

During the operation of undercutting, when the machine is being drawn along the face of thecoal by the cable 12, there is a tendency for the outer end of the machine y to swing around in the direction in which the machine is moving, because ordinarily 'the friction between the bed frame and Hoor of the mine is not suilicient to balance the reaction of the coal upon the cutter frame. For the purpose of controlling the angular position of the machine relative to the face of the coal and of holding it up to its work, I provide the following devices: 8O is an elongated guide bar arranged across the inner end of the bed frame and detachabl and adjustably connected to said frame. shoe which is slidably mounted on thebar 8O vis pivoted to a bracket or lug 82 carried by the top plate of the bed frame. 83 is a tie rod pivotally connected at one end to the bar 80 and at its other end to an eye 84 carried by the bed frame near the inner right hand corner thereof. 85 is a tie 'and brace rod pivotally connected at its inner end to the right hand end of the bar 8O and at its outer end adjustably connected to the outer right hand corner of the bed frame. This latter connection is preferably made by means of a forked lug or bracket 8G carried by the .bed frame of the machine and a nut 87 which is threaded on the outer end of the rod 85. This nut has a rounded inner end which engages the correspondingly concaved face of the lug 86, and is shaped at its outer end to form a hand wheel which can be grasped and readily turned to adjust the nut on the rod. With this construction the guide bar 80 can be adjustably secured in any desired angular relation to the machine.

At its forward end the guideA bar 80 is endwise into the coal. In doing this the machine must be guided and this can be done in various ways. The method indicated in the drawings involves the use of a jack 94 which is passed through the longitudinal slot or opening in the cutter bar with its lower end engaging the iioor and its upper end engaging the roof of the mine. This jack having been set as in Fig. 8, the feed cable 12 is passed outward over the guide sheaves 90, 91 and 92, and thence inward to a jack 95 to which its end is secured. The motor having been started and the cutters thrown into operation, the clutch 54 is thrown into engagement with the pinion 49, thus driving the cutters and turning the winding drum 11 at slow speed. The tension on the cable 12 draws the machine inward against the coal, forcing the cutter frame under the coal as the latter is cut away. The reaction of the cutters as the entering cut begins tends to throw the inner end of the cutter frame to the right, but this action is counteracted by the guiding eii'ect of the jack 94; and the draft of the cableon the outer ri ht hand corner of the bed frame of the mac ine overcomes any tendency of thpt outer end of the machine to swing to the jack 94 is removed and the cable 12 extended along the face to the left rib where it is made fast to an anchor or a jack 96. A jaclr is then placed at 97 with its lower end bearing against the front side of the -bed frame near the outer end thereof. Thereupon the machine is again started and, as the jack at 97 prevents the advance of the outer end of the machine, the winding up of the cable 12 causes the lnner end of the machine to be curved outward away from the face of the coal and on its extreme end is mounted a guide sheave 89 for the draft cable- 12.

At various points on the bed frame of the machine I provide idler guide sheaves over which the feed cable 12 can be passed in various Ways when it is desired to move the ,machine about over the floor of the mine by means of its own power. On the outer end of the bed frame I mount sheaves 90, 91 and 92, and on the rear or right hand side of the bed frame I provide a sheave 93.

The operation of the machine will now be readily understood. A The machine, on being brought into the mine roo-m, `is unloaded from the truck and brought to the face 'of the coal near one of the ribs. Assuming that the Y tion approximating that shown in Fig. 10 with the cutter bar angled well forward, the.

machine is stopped and the guide bar 80 is attached in the manner indicated in Fig. 11,. It will be observed on referring to this {igure that the guide bar 80 constitutes in v.effect a forward extension of the machine, giving it a bearingagainst'the coal well in ad-v vance of thecutters. It 'will be noted too that the guide cable is carried inside the guide sheave 89 so that the effective line of graft on the machine is brought close to the a'ce.

The machine is now 'started again and the The angular ad-v undercutting proceeds. Vance of the cutter bar is such that the drag of the bits in the` coal tends to hold the machine close up to the face and the forward extension accorded'by the guide bar 8O serves 'intatte ,et

to prevent the outer end of the machine from swinging forward. If, as the cutting proceeds, the material encountered by the cutters varies in hardness, it may be desirable of the coal somewhat, and this the machine runner can easily do by simply turning the hand wheel 88.

The narrow cutter bar 4 in one of these 'i l0 machines extends'six or seven feet under the coal, and it so holds the chain that the active 'l cutters follow an approximately straight line off-substantially that length, and along this line the cutters bear outwardly on the coal' `l at points inside of the 2t? an obtuse anglevinclined forward and inward, as shown in Fig. l1, the bed frame outside of the face tends to be drawn inward by the reactionary force. element must be held rigidly in its angular position, relatively to the coal face, or it will still .tend to swing backward and outward. Thebar 8O is a rigid element angularly related to the cutter, and with its front end so "arranged as to bear against the coal face.

` The connection between the bar and the cut- ',ter element being rigid, the latter cannot swing backward except as the rear part of the bar 80 swings outward. Such movement is prevented by the inner portion of the cutter element bearing'against a mass of coal .in its native bed. Thus the bed frame, with the parts attached, including the rigid bar extension,.are held firmly in predetermined positions without requiring guide rails,

posts, ropes or chains at the outer end of the bed, said end being free tomove forward or back when no draft is exerted.

rlhe undercutting proceeds in the manner described until the front end of the guide bar 80 approaches the left rib or wall of the room. At this time the feed cable 12 is disengaged from the guide sheave 89 and, as the front end of the guide bar 80 comes into n engagement with the side wall as shown in "0 Fig. l2, the machine is stopped. Then the rods 83 and 85 are detached and a jack is placed at 98 with its lower end against the outer side of the rear end of the bar 80.A The machine is now started again and the undercutting proceeds, the guide bar 80 remain! ing stationary while the machine advances along it. VDuring this further advance of the machine along the guide bar,- the outer vend of the machine gradually swings forward until a position is reached such as shown in Fig. 13. Thereupon the machine is again. stopped,V the guide bar is removed and a jacl is placed at 99 against the front outer corner of the machine. Then the machine having again beenstarted, 1t is swung to vary the angle of the machine to the face But the cutting frame of the machine,

forward to the position shown in Fig. 14 thus bringing the undercut close to the rib so that the width of the room is maintained.

During the undercutting the rate of feed can at all times be varied and controlled by 70 means of the friction clutch27 for, by simply pressing gdownward onthe hand lever 42, the machine .runner is enabled to diminish the pressure on the follower plate 29 of the clutch to' any desired amount so as to 75 correspondingly reduce the rate of feed. This is especially advantageous when the cutter bar is to be swung forward at the beginning of the side cut and again at the end of the side cut. v80 When the undercut is completed, the feed cable l2 can be extended to a point adjacent the truck at the right side of the room and the machine drawn over theffloor of the mine by its own power and similarly loaded 85 upon the truck in the now well known manner of handling machines of this character.

While I have set forth the particular preferred form of guide bar and the particular preferred manner of connecting it to the bed it should be understood that there can be wide lvariation as to 'these matters within the scope of my invention as set forth in the following claims.

I do not claim as of my invention any of the features of construction incident to the bed frame, Athe motor, the gearing, or the cutting apparatus, by themselves considered, as I am aware .that these are well known. Ent the parts more particularly characterizing my improvement are intimately correlated withthese devices, and I have' shown anddescribed them in order that lallmatters of operation may be readily under stood.

,'What I claim is:

1. The combination of the relatively narrow bed frame extending longitudinally outward from the coal face, the narrow cutter bar projecting inward from the inner end of said frame, the cutter ychain Ymoving around said bar, the bar and chain being adapted to be inclined forward and inward to form an elongated, inclined, rectilineal cut; an elongated, horizontally-arranged detachable abutment bar adapted to be held rigidly in relation to the cutting apparatus and bearing against the coal at points in advance of and relatively remote from the longitudinal axis of the cutting apparatus and adapted to hold vsaid axis at an acute' angle of inclination to the coal face, and a draft device for propelling the machine alongthe coal face, said draft device Vengaging with the front end of said abutment bar, and also with a stationary abutment in advance of the bar; said parts being arranged to cause the draft to be exerted valong a line close to the coal face. v

2.` The combination of the bedv frame, the 11.30

- cutting mechanism projecting from the inprising av iexible draft device for propelling y tobe extended inward along the cutter barV ner end of said frame and comprising a narrow, elongated bar and a cutter chain moving around the said bar, the cutter mechanism being adapted to be inclined for ward and inwardto form an elongated, in-

; clined rectilineal out, a detachablelguidng t abutment bar held rigidly, but adjustably,

in relation to the cutting apparatus and adapted tohold the latter' at either of several acute angles of inclination to the coal face, and a draft device engaging with the front end ofsaid abutment bar, the outer y end of the bed frame being normally free for movement forward or backward.

3. In a mining machine, the combination of a relatively narrow bedframe, a cutter bar projecting from the inner end ofthe bed .frame and rigid therewith, an endless cutter chain mounted on the said bar, means comthe machine, said draft device being adapted so as to pull the machine endwise and project the cutter bar under the coal along lines close to one side wall of a mine room and j also to be extended from the machine along 4:. In a mining machine, the combination of a relatively narrow bed frame, a cutter bar projecting from the inner end of the bed frame and rigid therewith, an endless cutter chain mounted on the said bar, means comprislng a flexible draft device for propelling the machine,r said draft device being adapted to be extended inwardalongthe cutter bar. so as to pull the machine end- .wise and project the cutter' bar under the coal along lines close to one side wall of a mine room and also to be extended from the machine along the coal face so as to propel the machine laterally toward the other side 'wall of the room, a guide bar extending forward from the bed frame to engage the coal face, a shoe slidably engaging said bar and pivotally connected to the bed frame, means for normally preventing the guide bar from sliding relative to the shoe but adapted when disengaged to permit such movement, and means for securing the guide bar in definite angular relation to the longitudinal axis of the machine.

5. In a mining machine, the combination of a relatively narrow bed frame, a cutter bar projecting from the inner end of the bed frame and rigid therewith, an endless cutter chain mounted on the said bar, means comprising a exiblc draft device for propelling the machine, said draft device being adapted to be extended inward along the cutter bar so as to pull the machine endwise and project the cutter`bar under the coal along lines close to one side wall of a mine room and also to be extended from the machine along the coal face so as to propel the machine laterally toward the other side wall of the room, a guide liar extending forward from the bed frame to engage the coal face, a shoe slidably engaging said bar and pivotally connected to the bed frame, means for normally preventing the guido bar from sliding relative to the shoe but adapted when "disengaged to permit ISuch movement, and adjustable means for securing the guide bar in definite angular relation to the longitudinal axis of the machine.

In testimony' whereof, I aitix my signature, impl-esencia of two witnesses.

j DUDLEY T. FISHER. Witnesses:

RJ. HENRY, E. P. SNIVELY. 

